Getting info from existing X clients...

This is a discussion on Getting info from existing X clients... within the Linux Programming forums, part of the Platform Specific Boards category; I'm trying to figure out if an application that is running is running fullscreen.
By querying the application with xwininfo ...

This doesn't give me much to go by as my current resolution is 1024x768. Please note that even though this is a fullscreen app running at 800x600 - xdpyinfo and xrandr both report the screen res at 1024x768